Recently I also started experiencing this kind of problem. It manifests itself with the syslog and terminal being spammed with the following type of messages at, what it seems, random intervals (sometimes it’s one “cycle” in 30 minutes, sometimes it’s 30 “cycles” in 10 minutes):

After only 7 hours of having the system up, here’s what I get after piping the following:

Code:

# cat /var/log/syslog | grep -i edid | grep "drm:drm" | wc -l
284

Also, it makes the display freeze for various intervals of time, varying from few short moments to tens of seconds. On couple of ocassions the display went blank with only mouse pointer being present and KDE firing up a message about no monitor being connected to the system.

The monitor is Samsung S24A350H, which is connected to the Radeon X1650Pro GPU with a DVI->HDMI cable. At first I thought the cable was the culprit and to rule that one out I used VGA interface to connect the two. However, the problem remained and the same goes for IgnoreEDID option in xorg.conf.

Strangely enough, at bootup, everything seems to be OK, since these lines get stored in the syslog: